Story perspectives

End of COMEXA Sparks Screwworm Resurgence; Missouri Tightens Rules

7/2/2026

Left

Missouri Tightens Rules

Experts warn that ending the U.S.–Mexico COMEXA program in 2012 left the region vulnerable, spurring the screwworm resurgence.
Missouri’s Department of Agriculture announced tighter veterinary-inspection rules for animals from any New World screwworm-infested area, despite reporting no cases.
The rule requires a 14-day Certificate of Veterinary Inspection confirming animals are free of screwworm.
USDA said screwworm poses no food-supply threat, noting critics blame budget cuts and isolationist policies.

Right

Blanco County Declares

Blanco County officials declared a local disaster to prepare for possible New World screwworm spread despite no reported cases.
The USDA reports 29 confirmed New World screwworm cases in Texas, with the nearest incident in Harper, Gillespie County.
Missouri enacted tighter veterinary-inspection rules for animals entering from any New World screwworm-infested area.
Rancher Maria Mathis-Kruser said the threat creates mental stress and extra labor for local producers.

Center

USDA Releases Flies

The USDA opened a 22,000-square-foot sterile-fly facility in Metapa, Mexico, capable of producing up to 100 million flies when fully operational.
Officials confirmed 27 New World screwworm cases in Texas, most recently in Crockett and Jim Hogg counties.
Federal and state agencies established quarantine zones in Medina, Crockett and Edwards counties.
They also began aerial releases of sterile insects to curb the screwworm spread.

Blindspot

Center coverage emphasized the USDA’s new 22,000-square-foot sterile-fly production plant in Metapa, Mexico, and the associated aerial sterile-insect releases, which Right coverage omitted.
Center coverage highlighted a $3.74 million University of Arizona grant for rapid PCR diagnostics and precision-livestock monitoring, a detail not mentioned in the Right summary.

History

Historical Context

After Edward Knipling and Raymond Bushland proved the sterile-insect technique on Sanibel Island in the early 1950s and eradicated the screwworm from the United States by 1960, the program released more than 94 billion sterile flies between 1962 and 1975. A 2026 Texas outbreak, first USDA detection on June 3, revives reliance on the same SIT infrastructure, now sustained by decades-long sterile-fly production facilities.

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Missouri Tightens Rules

Experts warn that ending the U.S.–Mexico COMEXA program in 2012 left the region vulnerable, spurring the screwworm resurgence.
Missouri’s Department of Agriculture announced tighter veterinary-inspection rules for animals from any New World screwworm-infested area, despite reporting no cases.
The rule requires a 14-day Certificate of Veterinary Inspection confirming animals are free of screwworm.
USDA said screwworm poses no food-supply threat, noting critics blame budget cuts and isolationist policies.

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